Transcript ● Well Completions (casing protocols) ● Acidizing ● Fracture treatments Types of casing Casing Shoe: a short, heavy, cylindrical section of steel filled with concrete and.

● Well Completions
(casing protocols)
● Acidizing
● Fracture treatments
1
Types of
casing
2
Casing Shoe: a short, heavy,
cylindrical section of steel filled with
concrete and rounded at the bottom,
which is placed at the end of the
casing string. It prevents the casing
from snagging on irregularities in the
borehole as it is lowered. A passage
through the center of the shoe allow
drilling fluid to pass up into the
casing while it is being lowered and
allows cement to pass out during
cementing operations. Also called a
shoe guide
Open-hole completion
3
Liner completion
4
Surface casing
Production tubing
Perforated
casing
completion
Production casing
Packer
Oil
sandstone
Perforations
Casing shoe
5
Multi-zone
completion
6
Well Acidizing
Used to increase production rates
• Well-bore clean-up
• Mineral and matrix dissolution
• Acid fracturing – deep fm stimulation
7
Fracture Treating
(Used in most wells)
• Generally uses a proppant to keep fractures
open. Fine-grained sand commonly used.
• Delivery fluids:
–
–
–
–
–
–
–
Water-based
Polymer (reduce friction) = slick water fracs
Cross-linked polymer = changes viscosity
Air
Foam
Gas (nitrogen)
Acid gel
8
Fracture treatment of horizontal gas-shales
9
10
11